Knuckle Up.
Get Fit.

No matter your age or skill level, you always have the opportunity to learn a new fitness skill and build real body strength at Knuckle Up Martial Arts and Fitness. From your first day on the mat, our skilled instructors meet you where you are and help you grow stronger, sharper, and more confident.

We blend traditional martial arts values and techniques with modern, athletic training. You will learn the discipline and respect that have defined the martial arts for centuries while staying current with the striking, grappling, and conditioning methods used by today's fighters and fitness athletes.

Traditional Values, Modern Training

Our Jacksonville gym is built around one idea: anyone can train. Whether you walk in looking to lose weight, defend yourself, burn off stress after work, or chase a competitive goal, there is a place for you here. Our programs span striking, grappling, and full mixed martial arts, with dedicated tracks for children and beginners.

• Kickboxing — high-energy cardio and striking that can burn over 1,000 calories an hour.
• Brazilian Jiu Jitsu — leverage-based ground fighting where technique beats size.
• Taekwon Do — classic hand-and-foot self-defense for every belt level.
• MMA — the complete combat skill set, for fitness or competition.
• Muay Thai — the art of eight limbs, Thailand's stand-up striking discipline.
• Children's Programs — focus, confidence, and anti-bullying skills for ages 3 to 15.

Try Us Out for Free

Check us out and see what the hype is about before making any commitment. New students can take a FREE 10-day trial with no obligations. Like what you experience? Take advantage of our no-contract payment option and train without a strict long-term commitment. Discipline starts the moment you decide to begin.

A Family-Friendly Gym

Martial arts is for the whole family. Parents and kids train under the same roof in a welcoming, supportive environment. The benefits go far beyond the mat: research from the U.S. Centers for Disease Control and Prevention shows that regular physical activity improves strength, mood, and long-term health for every age group.

Ready to begin? Get in touch to claim your free trial, or explore our class schedule to find a time that fits your week.